The area within the boundaries of the city in which a state employee's place of employment is located. If an employee's place of employment is located within an unincorporated area, then the area within a five-mile radius of the place of employment is the employee's designated headquarters. If an incorporated municipality or an unincorporated area is completely surrounded by the incorporated municipality in which an employee's place of employment is located, then the employee's designated headquarters includes the surrounded municipality or area. Texas Government Code Section 660.002(7)

Duty Point

The destination, other than a place of employment, to which a state employee travels to conduct official state business. If the destination is outside the employee's designated headquarters, then the duty point is either the incorporated municipality in which the destination is located or the unincorporated area within a five-mile radius of the destination. Texas Government Code Section 660.002(9)

Incidental Expense

An expense incurred while traveling on official state business. The term includes a mandatory insurance or service charge and an applicable tax, except a tax based on the cost of a meal. The term does not include a meal, lodging or transportation expense, a personal expense, an expense that an individual would incur regardless of whether the individual were traveling on official state business, a tip or a gratuity. Texas Government Code Section 660.002(10)

State Employee

An individual employed by a state agency, including a key official. Texas
Government Code Section 660.002(20) The term includes prospective state employees and aircraft pilots.